Defensive publication



T qoi i DEFENSIVE PUBLICATION UNITED STATES PATENT OFFICE Published at the request of the applicant or owner in accordance with the Notice of Apr. 11, 1968, 849 O.G. 1221. I entiflcation is by serial number of the application and the heading indicates the number of pages of specification, including claims, and oi. sheets of drawing contained in the application as originally filed. The file of this application is available to the public for inspection; reproduction may be purchased for 30 cents per sheet.

Applications published under the Defensive Publication Program have not been examined as to the merits of alleged invention. The Patent Oflice makes no assertion as to the novelty of the disclosed subject matter.

PUBLISHED JULY 29, 1969 781,712 POLYMERIC TOBACCO SMOKE FILTER MATERIAL FOR THE SELECTIVE RE- MOVAL OF ACROLEIN Ray E. Leonard, P.0. Box 511, Kingsport, Tenn. 37662 Continuation of application Ser. No. 648,972, June 26, 1967. This application Dec. 4, 1968. Published July 29, 1969 Int. Cl. A24f 7/04, 13/04; A24b 15/00 US. Cl. 131-266 No Drawing. 12 Pages Specification Certain porous and permeable polymers such as crosslinked polystyrenes, ethyl vinyl-benzene-divinyl benzene, ethyl vinyl-styrene-divinyl benzene or any similar polymeric material can be added to or used as tobacco smoke zfilter elements for selectively removing acrolein from tobacco smoke. This polymeric material is preferably employed in particulate form and associated with a carrier material, such as filamentary cellulose acetate. The polymeric particles have a bulk density between 11.5 and 80 g./cc. and a surface area between about 100 and 660 mF/g. 

